Error converting data type varchar to bigint in stored procedure - sql

Question

I'm trying to call this procedure with the usp_TimesheetsAuditsLoadAllbyId 42747, NULL command.
But I always get an error
Msg 8114, Level 16, State 5, Procedure usp_TimesheetsAuditsLoadAllById, Line 9
Error converting data type varchar to bigint.
The ID of TimesheetsAudits table is a bigint type. I tried several types of conversions and casts, but I'm really stuck right now.
Hope somebody can help. Thanks
ALTER PROCEDURE [dbo].[usp_TimesheetsAuditsLoadAllById]
(
#Id INT,
#StartDate DATETIME
)
AS
BEGIN
SET NOCOUNT ON
SELECT TOP 51 *
FROM
(SELECT TOP 51
ID,
Type,
ReferrerId,
CAST(Description AS VARCHAR(MAX)) AS Description,
OnBehalfOf,
Creator,
DateCreated
FROM
TimesheetsAudits
WHERE
(ReferrerID = #Id) AND
(#StartDate IS NULL OR DateCreated < #StartDate)
ORDER BY
DateCreated DESC
UNION
SELECT TOP 51
tia.ID,
tia.Type,
tia.ReferrerId,
'[Day: ' + CAST(DayNr AS VARCHAR(5)) + '] ' + CAST(tia.Description AS VARCHAR(MAX)) AS Description,
tia.OnBehalfOf,
tia.Creator,
tia.DateCreated
FROM
TimesheetItemsAudits tia
INNER JOIN
TimesheetItems ti ON tia.ReferrerId = ti.ID
WHERE
(ti.TimesheetID = #Id) AND
(#StartDate IS NULL OR tia.DateCreated < #StartDate)
ORDER BY
tia.DateCreated DESC) t
ORDER BY
t.DateCreated DESC
END
Table definition for tables from comments:
CREATE TABLE [dbo].[TimesheetsAudits](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[Type] [tinyint] NOT NULL,
[ReferrerId] [varchar](15) NOT NULL,
[Description] [text] NULL,
[OnBehalfOf] [varchar](10) NULL,
[Creator] [varchar](10) NOT NULL,
[DateCreated] [datetime] NOT NULL
)
CREATE TABLE [dbo].[TimesheetItemsAudits](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[Type] [tinyint] NOT NULL,
[ReferrerId] [varchar](15) NOT NULL,
[Description] [text] NULL,
[OnBehalfOf] [varchar](10) NULL,
[Creator] [varchar](10) NOT NULL,
[DateCreated] [datetime] NOT NULL
)

Answer 1

You perform an INNER JOIN of [dbo].[TimesheetsAudits] and TimesheetItems ti ON tia.ReferrerId = ti.ID
tia.[ReferrerId] is varchar and ti.[ID] is [bigint].
I'd expect a value in tia.[ReferrerId] that cannot be converted to bigint.
Try the following:
SELECT [ReferrerId] FROM TimesheetItemsAudits WHERE ISNUMERIC(ReferrerId) = 0
This may help you to find the "offending rows".